先查一查真空，还有camshaft position sensor

P0300 JEEP - Cylinder Misfire Fault Detected Random Cylinders 1 | Add Comment Possible causes Faulty spark plug (s) Faulty ignition coil (s) Clogged or faulty fuel injector (s) Intake air leak Fuel injectors harness is open or shorted Fuel Injectors circuit poor electrical connection Ignition coils harness is open or shorted Ignition coils circuit poor electrical connection Insufficient cylinders compression Incorrect fuel pressure

Read more: https://www.autocodes.com/p0300_jeep.html